I'm sending it back tomorrow for them to fix it. I think it's a problem with the cord not working properly and cutting off the power supply. Hopefully they will repair it for me as it's getting worse and worse.

I got mine new at Christmas 2010. This Christmas it went crazy beeping constantly and it wouldnt heat up, I brought it back to the shop it was bought in and they sent it back to the factory...they replaced it within ten days.
A friend said hers did the same in really cold weather but if you heated the room it didnt happen